Bump containerd to v1.7.20 #285

Job	Run time
build / Build	6m 33s
E2E Tests (startup)	7m 9s
E2E Tests (s3)	7m 46s
Docker Tests (basics)	1m 10s
E2E Tests (btrfs)	4m 25s
Docker Tests (bootstraptoken)	54s
E2E Tests (externalip)	5m 18s
Docker Tests (cacerts)	1m 2s
E2E Tests (privateregistry)	5m 20s
Docker Tests (compat)	2m 28s
E2E Tests (embeddedmirror)	5m 35s
Docker Tests (lazypull)	56s
E2E Tests (wasm)	4m 51s
Docker Tests (upgrade)	2m 46s
	56m 13s

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